Rollup merge of #90856 - ken-matsui:suggestion-to-wrap-vec-allocator-api-in-tuple, r=davidtwco

Suggestion to wrap inner types using 'allocator_api' in tuple

This PR provides a suggestion to wrap the inner types in tuple when being along with 'allocator_api'.

Closes https://github.com/rust-lang/rust/issues/83250

```rust
fn main() {
    let _vec: Vec<u8, _> = vec![]; //~ ERROR use of unstable library feature 'allocator_api'
}
```

```diff
 error[E0658]: use of unstable library feature 'allocator_api'
   --> $DIR/suggest-vec-allocator-api.rs:2:23
    |
 LL |     let _vec: Vec<u8, _> = vec![];
-   |                       ^
+   |                   ----^
+   |                   |
+   |                   help: consider wrapping the inner types in tuple: `(u8, _)`
    |
    = note: see issue #32838 <https://github.com/rust-lang/rust/issues/32838> for more information
    = help: add `#![feature(allocator_api)]` to the crate attributes to enable
```

compiler/rustc_resolve/src/macros.rs

@@ -1133,6 +1133,7 @@ impl<'a> Resolver<'a> {
                         feature,
                         reason,
                         issue,
+                        None,
                         is_soft,
                         span,
                         soft_handler,